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题名: Speciation of the major inorganic salts in atmospheric aerosols of Beijing, China: Measurements and comparison with model
作者: Tang, Xiong; Zhang, Xiaoshan; Ci, Zhijia; Guo, Jia; Wang, Jiaqi
刊名: ATMOSPHERIC ENVIRONMENT
出版日期: 2016-05
卷号: 133, 期号:0, 页码:123-134
关键词: Speciation ; Inorganic salts ; Gas-aerosol partitioning ; Thermodynamic equilibrium
DOI: 10.1016/j.atmosenv.2016.03.013
部门归属: 大气环境科学实验室
英文摘要: In the winter and summer of 2013-2014, we used a sampling system, which consists of annular denuder, bacic-up filter and thermal desorption set-up, to measure the speciation of major inorganic salts in aerosols and the associated trace gases in Beijing. This sampling system can separate volatile ammonium salts (NH4NO3 and NH4Cl) from non-volatile ammonium salts ((NH4)(2)SO4), as well as the non-volatile nitrate and chloride. The measurement data was used as input of a thermodynamic equilibrium model (ISORROPIA II) to investigate the gas aerosol equilibrium characteristics. Results show that (NH4)(2)SO4, NH4NO3 and NH4Cl were the major inorganic salts in aerosols and mainly existed in the fine particles. The sulfate, nitrate and chloride associated with crustal ions were also important in Beijing where mineral dust concentrations were high. About 19% of sulfate in winter and 11% of sulfate in summer were associated with crustal ions and originated from heterogeneous reactions or direct emissions. The nonvolatile nitrate contributed about 33% and 15% of nitrate in winter and summer, respectively. Theoretical thermodynamic equilibrium calculations for NH4NO3 and NH4Cl suggest that the gaseous precursors were sufficient to form stable volatile ammonium salts in winter, whereas the internal mixing with sulfate and crustal species were important for the formation of volatile ammonium salts in summer. The results of the thermodynamic equilibrium model reasonably agreed with the measurements of aerosols and gases, but large discrepancy existed in predicting the speciation of inorganic ammonium salts. This indicates that the assumption on crustal species in the model was important for obtaining better understanding on gas aerosol partitioning and improving the model prediction. (C) 2016 Elsevier Ltd. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35715
Appears in Collections:大气环境科学实验室_期刊论文

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Recommended Citation:
Tang, Xiong,Zhang, Xiaoshan,Ci, Zhijia,et al. Speciation of the major inorganic salts in atmospheric aerosols of Beijing, China: Measurements and comparison with model[J]. ATMOSPHERIC ENVIRONMENT,2016,133(0):123-134.
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